/*
 * jQuery UI Sortable @VERSION
 *
 * Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Sortables
 *
 * Depends:
 *      jquery.ui.core.js
 *      jquery.ui.mouse.js
 *      jquery.ui.widget.js
 */
(function($) {

$.widget("ui.sortable", $.ui.mouse, {
        options: {
                appendTo: "parent",
                axis: false,
                connectWith: false,
                containment: false,
                cursor: 'auto',
                cursorAt: false,
                dropOnEmpty: true,
                forcePlaceholderSize: false,
                forceHelperSize: false,
                grid: false,
                handle: false,
                helper: "original",
                items: '> *',
                opacity: false,
                placeholder: false,
                revert: false,
                scroll: true,
                scrollSensitivity: 20,
                scrollSpeed: 20,
                scope: "default",
                tolerance: "intersect",
                zIndex: 1000
        },
        _create: function() {

                var o = this.options;
                this.containerCache = {};
                this.element.addClass("ui-sortable");

                //Get the items
                this.refresh();

                //Let's determine if the items are floating
                this.floating = this.items.length ? (/left|right/).test(this.items[0].item.css('float')) : false;

                //Let's determine the parent's offset
                this.offset = this.element.offset();

                //Initialize mouse events for interaction
                this._mouseInit();

        },

        destroy: function() {
                this.element
                        .removeClass("ui-sortable ui-sortable-disabled")
                        .removeData("sortable")
                        .unbind(".sortable");
                this._mouseDestroy();

                for ( var i = this.items.length - 1; i >= 0; i-- )
                        this.items[i].item.removeData("sortable-item");

                return this;
        },

        _mouseCapture: function(event, overrideHandle) {

                if (this.reverting) {
                        return false;
                }

                if(this.options.disabled || this.options.type == 'static') return false;

                //We have to refresh the items data once first
                this._refreshItems(event);

                //Find out if the clicked node (or one of its parents) is a actual item in this.items
                var currentItem = null, self = this, nodes = $(event.target).parents().each(function() {
                        if($.data(this, 'sortable-item') == self) {
                                currentItem = $(this);
                                return false;
                        }
                });
                if($.data(event.target, 'sortable-item') == self) currentItem = $(event.target);

                if(!currentItem) return false;
                if(this.options.handle && !overrideHandle) {
                        var validHandle = false;

                        $(this.options.handle, currentItem).find("*").andSelf().each(function() { if(this == event.target) validHandle = true; });
                        if(!validHandle) return false;
                }

                this.currentItem = currentItem;
                this._removeCurrentsFromItems();
                return true;

        },

        _mouseStart: function(event, overrideHandle, noActivation) {

                var o = this.options, self = this;
                this.currentContainer = this;

                //We only need to call refreshPositions, because the refreshItems call has been moved to mouseCapture
                this.refreshPositions();

                //Create and append the visible helper
                this.helper = this._createHelper(event);

                //Cache the helper size
                this._cacheHelperProportions();

                /*
                 * - Position generation -
                 * This block generates everything position related - it's the core of draggables.
                 */

                //Cache the margins of the original element
                this._cacheMargins();

                //Get the next scrolling parent
                this.scrollParent = this.helper.scrollParent();

                //The element's absolute position on the page minus margins
                this.offset = this.currentItem.offset();
                this.offset = {
                        top: this.offset.top - this.margins.top,
                        left: this.offset.left - this.margins.left
                };

                // Only after we got the offset, we can change the helper's position to absolute
                // TODO: Still need to figure out a way to make relative sorting possible
                this.helper.css("position", "absolute");
                this.cssPosition = this.helper.css("position");

                $.extend(this.offset, {
                        click: { //Where the click happened, relative to the element
                                left: event.pageX - this.offset.left,
                                top: event.pageY - this.offset.top
                        },
                        parent: this._getParentOffset(),
                        relative: this._getRelativeOffset() //This is a relative to absolute position minus the actual position calculation - only used for relative positioned helper
                });

                //Generate the original position
                this.originalPosition = this._generatePosition(event);
                this.originalPageX = event.pageX;
                this.originalPageY = event.pageY;

                //Adjust the mouse offset relative to the helper if 'cursorAt' is supplied
                (o.cursorAt && this._adjustOffsetFromHelper(o.cursorAt));

                //Cache the former DOM position
                this.domPosition = { prev: this.currentItem.prev()[0], parent: this.currentItem.parent()[0] };

                //If the helper is not the original, hide the original so it's not playing any role during the drag, won't cause anything bad this way
                if(this.helper[0] != this.currentItem[0]) {
                        this.currentItem.hide();
                }

                //Create the placeholder
                this._createPlaceholder();

                //Set a containment if given in the options
                if(o.containment)
                        this._setContainment();

                if(o.cursor) { // cursor option
                        if ($('body').css("cursor")) this._storedCursor = $('body').css("cursor");
                        $('body').css("cursor", o.cursor);
                }

                if(o.opacity) { // opacity option
                        if (this.helper.css("opacity")) this._storedOpacity = this.helper.css("opacity");
                        this.helper.css("opacity", o.opacity);
                }

                if(o.zIndex) { // zIndex option
                        if (this.helper.css("zIndex")) this._storedZIndex = this.helper.css("zIndex");
                        this.helper.css("zIndex", o.zIndex);
                }

                //Prepare scrolling
                if(this.scrollParent[0] != document && this.scrollParent[0].tagName != 'HTML')
                        this.overflowOffset = this.scrollParent.offset();

                //Call callbacks
                this._trigger("start", event, this._uiHash());

                //Recache the helper size
                if(!this._preserveHelperProportions)
                        this._cacheHelperProportions();


                //Post 'activate' events to possible containers
                if(!noActivation) {
                         for (var i = this.containers.length - 1; i >= 0; i--) { this.containers[i]._trigger("activate", event, self._uiHash(this)); }
                }

                //Prepare possible droppables
                if($.ui.ddmanager)
                        $.ui.ddmanager.current = this;

                if ($.ui.ddmanager && !o.dropBehaviour)
                        $.ui.ddmanager.prepareOffsets(this, event);

                this.dragging = true;

                this.helper.addClass("ui-sortable-helper");
                this._mouseDrag(event); //Execute the drag once - this causes the helper not to be visible before getting its correct position
                return true;

        },

        _mouseDrag: function(event) {

                //Compute the helpers position
                this.position = this._generatePosition(event);
                this.positionAbs = this._convertPositionTo("absolute");

                if (!this.lastPositionAbs) {
                        this.lastPositionAbs = this.positionAbs;
                }

                //Do scrolling
                if(this.options.scroll) {
                        var o = this.options, scrolled = false;
                        if(this.scrollParent[0] != document && this.scrollParent[0].tagName != 'HTML') {

                                if((this.overflowOffset.top + this.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity)
                                        this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop + o.scrollSpeed;
                                else if(event.pageY - this.overflowOffset.top < o.scrollSensitivity)
                                        this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop - o.scrollSpeed;

                                if((this.overflowOffset.left + this.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity)
                                        this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft + o.scrollSpeed;
                                else if(event.pageX - this.overflowOffset.left < o.scrollSensitivity)
                                        this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft - o.scrollSpeed;

                        } else {

                                if(event.pageY - $(document).scrollTop() < o.scrollSensitivity)
                                        scrolled = $(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
                                else if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity)
                                        scrolled = $(document).scrollTop($(document).scrollTop() + o.scrollSpeed);

                                if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity)
                                        scrolled = $(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
                                else if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
                                        scrolled = $(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);

                        }

                        if(scrolled !== false && $.ui.ddmanager && !o.dropBehaviour)
                                $.ui.ddmanager.prepareOffsets(this, event);
                }

                //Regenerate the absolute position used for position checks
                this.positionAbs = this._convertPositionTo("absolute");

                //Set the helper position
                if(!this.options.axis || this.options.axis != "y") this.helper[0].style.left = this.position.left+'px';
                if(!this.options.axis || this.options.axis != "x") this.helper[0].style.top = this.position.top+'px';

                //Rearrange
                for (var i = this.items.length - 1; i >= 0; i--) {

                        //Cache variables and intersection, continue if no intersection
                        var item = this.items[i], itemElement = item.item[0], intersection = this._intersectsWithPointer(item);
                        if (!intersection) continue;

                        if(itemElement != this.currentItem[0] //cannot intersect with itself
                                &&      this.placeholder[intersection == 1 ? "next" : "prev"]()[0] != itemElement //no useless actions that have been done before
                                &&      !$.ui.contains(this.placeholder[0], itemElement) //no action if the item moved is the parent of the item checked
                                && (this.options.type == 'semi-dynamic' ? !$.ui.contains(this.element[0], itemElement) : true)
                                //&& itemElement.parentNode == this.placeholder[0].parentNode // only rearrange items within the same container
                        ) {

                                this.direction = intersection == 1 ? "down" : "up";

                                if (this.options.tolerance == "pointer" || this._intersectsWithSides(item)) {
                                        this._rearrange(event, item);
                                } else {
                                        break;
                                }

                                this._trigger("change", event, this._uiHash());
                                break;
                        }
                }

                //Post events to containers
                this._contactContainers(event);

                //Interconnect with droppables
                if($.ui.ddmanager) $.ui.ddmanager.drag(this, event);

                //Call callbacks
                this._trigger('sort', event, this._uiHash());

                this.lastPositionAbs = this.positionAbs;
                return false;

        },

        _mouseStop: function(event, noPropagation) {

                if(!event) return;

                //If we are using droppables, inform the manager about the drop
                if ($.ui.ddmanager && !this.options.dropBehaviour)
                        $.ui.ddmanager.drop(this, event);

                if(this.options.revert) {
                        var self = this;
                        var cur = self.placeholder.offset();

                        self.reverting = true;

                        $(this.helper).animate({
                                left: cur.left - this.offset.parent.left - self.margins.left + (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollLeft),
                                top: cur.top - this.offset.parent.top - self.margins.top + (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollTop)
                        }, parseInt(this.options.revert, 10) || 500, function() {
                                self._clear(event);
                        });
                } else {
                        this._clear(event, noPropagation);
                }

                return false;

        },

        cancel: function() {

                var self = this;

                if(this.dragging) {

                        this._mouseUp();

                        if(this.options.helper == "original")
                                this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper");
                        else
                                this.currentItem.show();

                        //Post deactivating events to containers
                        for (var i = this.containers.length - 1; i >= 0; i--){
                                this.containers[i]._trigger("deactivate", null, self._uiHash(this));
                                if(this.containers[i].containerCache.over) {
                                        this.containers[i]._trigger("out", null, self._uiHash(this));
                                        this.containers[i].containerCache.over = 0;
                                }
                        }

                }

                //$(this.placeholder[0]).remove(); would have been the jQuery way - unfortunately, it unbinds ALL events from the original node!
                if(this.placeholder[0].parentNode) this.placeholder[0].parentNode.removeChild(this.placeholder[0]);
                if(this.options.helper != "original" && this.helper && this.helper[0].parentNode) this.helper.remove();

                $.extend(this, {
                        helper: null,
                        dragging: false,
                        reverting: false,
                        _noFinalSort: null
                });

                if(this.domPosition.prev) {
                        $(this.domPosition.prev).after(this.currentItem);
                } else {
                        $(this.domPosition.parent).prepend(this.currentItem);
                }

                return this;

        },

        serialize: function(o) {

                var items = this._getItemsAsjQuery(o && o.connected);
                var str = []; o = o || {};

                $(items).each(function() {
                        var res = ($(o.item || this).attr(o.attribute || 'id') || '').match(o.expression || (/(.+)[-=_](.+)/));
                        if(res) str.push((o.key || res[1]+'[]')+'='+(o.key && o.expression ? res[1] : res[2]));
                });

                return str.join('&');

        },

        toArray: function(o) {

                var items = this._getItemsAsjQuery(o && o.connected);
                var ret = []; o = o || {};

                items.each(function() { ret.push($(o.item || this).attr(o.attribute || 'id') || ''); });
                return ret;

        },

        /* Be careful with the following core functions */
        _intersectsWith: function(item) {

                var x1 = this.positionAbs.left,
                        x2 = x1 + this.helperProportions.width,
                        y1 = this.positionAbs.top,
                        y2 = y1 + this.helperProportions.height;

                var l = item.left,
                        r = l + item.width,
                        t = item.top,
                        b = t + item.height;

                var dyClick = this.offset.click.top,
                        dxClick = this.offset.click.left;

                var isOverElement = (y1 + dyClick) > t && (y1 + dyClick) < b && (x1 + dxClick) > l && (x1 + dxClick) < r;

                if(        this.options.tolerance == "pointer"
                        || this.options.forcePointerForContainers
                        || (this.options.tolerance != "pointer" && this.helperProportions[this.floating ? 'width' : 'height'] > item[this.floating ? 'width' : 'height'])
                ) {
                        return isOverElement;
                } else {

                        return (l < x1 + (this.helperProportions.width / 2) // Right Half
                                && x2 - (this.helperProportions.width / 2) < r // Left Half
                                && t < y1 + (this.helperProportions.height / 2) // Bottom Half
                                && y2 - (this.helperProportions.height / 2) < b ); // Top Half

                }
        },

        _intersectsWithPointer: function(item) {

                var isOverElementHeight = $.ui.isOverAxis(this.positionAbs.top + this.offset.click.top, item.top, item.height),
                        isOverElementWidth = $.ui.isOverAxis(this.positionAbs.left + this.offset.click.left, item.left, item.width),
                        isOverElement = isOverElementHeight && isOverElementWidth,
                        verticalDirection = this._getDragVerticalDirection(),
                        horizontalDirection = this._getDragHorizontalDirection();

                if (!isOverElement)
                        return false;

                return this.floating ?
                        ( ((horizontalDirection && horizontalDirection == "right") || verticalDirection == "down") ? 2 : 1 )
                        : ( verticalDirection && (verticalDirection == "down" ? 2 : 1) );

        },

        _intersectsWithSides: function(item) {

                var isOverBottomHalf = $.ui.isOverAxis(this.positionAbs.top + this.offset.click.top, item.top + (item.height/2), item.height),
                        isOverRightHalf = $.ui.isOverAxis(this.positionAbs.left + this.offset.click.left, item.left + (item.width/2), item.width),
                        verticalDirection = this._getDragVerticalDirection(),
                        horizontalDirection = this._getDragHorizontalDirection();

                if (this.floating && horizontalDirection) {
                        return ((horizontalDirection == "right" && isOverRightHalf) || (horizontalDirection == "left" && !isOverRightHalf));
                } else {
                        return verticalDirection && ((verticalDirection == "down" && isOverBottomHalf) || (verticalDirection == "up" && !isOverBottomHalf));
                }

        },

        _getDragVerticalDirection: function() {
                var delta = this.positionAbs.top - this.lastPositionAbs.top;
                return delta != 0 && (delta > 0 ? "down" : "up");
        },

        _getDragHorizontalDirection: function() {
                var delta = this.positionAbs.left - this.lastPositionAbs.left;
                return delta != 0 && (delta > 0 ? "right" : "left");
        },

        refresh: function(event) {
                this._refreshItems(event);
                this.refreshPositions();
                return this;
        },

        _connectWith: function() {
                var options = this.options;
                return options.connectWith.constructor == String
                        ? [options.connectWith]
                        : options.connectWith;
        },
       
        _getItemsAsjQuery: function(connected) {

                var self = this;
                var items = [];
                var queries = [];
                var connectWith = this._connectWith();

                if(connectWith && connected) {
                        for (var i = connectWith.length - 1; i >= 0; i--){
                                var cur = $(connectWith[i]);
                                for (var j = cur.length - 1; j >= 0; j--){
                                        var inst = $.data(cur[j], 'sortable');
                                        if(inst && inst != this && !inst.options.disabled) {
                                                queries.push([$.isFunction(inst.options.items) ? inst.options.items.call(inst.element) : $(inst.options.items, inst.element).not(".ui-sortable-helper").not('.ui-sortable-placeholder'), inst]);
                                        }
                                };
                        };
                }

                queries.push([$.isFunction(this.options.items) ? this.options.items.call(this.element, null, { options: this.options, item: this.currentItem }) : $(this.options.items, this.element).not(".ui-sortable-helper").not('.ui-sortable-placeholder'), this]);

                for (var i = queries.length - 1; i >= 0; i--){
                        queries[i][0].each(function() {
                                items.push(this);
                        });
                };

                return $(items);

        },

        _removeCurrentsFromItems: function() {

                var list = this.currentItem.find(":data(sortable-item)");

                for (var i=0; i < this.items.length; i++) {

                        for (var j=0; j < list.length; j++) {
                                if(list[j] == this.items[i].item[0])
                                        this.items.splice(i,1);
                        };

                };

        },

        _refreshItems: function(event) {

                this.items = [];
                this.containers = [this];
                var items = this.items;
                var self = this;
                var queries = [[$.isFunction(this.options.items) ? this.options.items.call(this.element[0], event, { item: this.currentItem }) : $(this.options.items, this.element), this]];
                var connectWith = this._connectWith();

                if(connectWith) {
                        for (var i = connectWith.length - 1; i >= 0; i--){
                                var cur = $(connectWith[i]);
                                for (var j = cur.length - 1; j >= 0; j--){
                                        var inst = $.data(cur[j], 'sortable');
                                        if(inst && inst != this && !inst.options.disabled) {
                                                queries.push([$.isFunction(inst.options.items) ? inst.options.items.call(inst.element[0], event, { item: this.currentItem }) : $(inst.options.items, inst.element), inst]);
                                                this.containers.push(inst);
                                        }
                                };
                        };
                }

                for (var i = queries.length - 1; i >= 0; i--) {
                        var targetData = queries[i][1];
                        var _queries = queries[i][0];

                        for (var j=0, queriesLength = _queries.length; j < queriesLength; j++) {
                                var item = $(_queries[j]);

                                item.data('sortable-item', targetData); // Data for target checking (mouse manager)

                                items.push({
                                        item: item,
                                        instance: targetData,
                                        width: 0, height: 0,
                                        left: 0, top: 0
                                });
                        };
                };

        },

        refreshPositions: function(fast) {

                //This has to be redone because due to the item being moved out/into the offsetParent, the offsetParent's position will change
                if(this.offsetParent && this.helper) {
                        this.offset.parent = this._getParentOffset();
                }

                for (var i = this.items.length - 1; i >= 0; i--){
                        var item = this.items[i];

                        var t = this.options.toleranceElement ? $(this.options.toleranceElement, item.item) : item.item;

                        if (!fast) {
                                item.width = t.outerWidth();
                                item.height = t.outerHeight();
                        }

                        var p = t.offset();
                        item.left = p.left;
                        item.top = p.top;
                };

                if(this.options.custom && this.options.custom.refreshContainers) {
                        this.options.custom.refreshContainers.call(this);
                } else {
                        for (var i = this.containers.length - 1; i >= 0; i--){
                                var p = this.containers[i].element.offset();
                                this.containers[i].containerCache.left = p.left;
                                this.containers[i].containerCache.top = p.top;
                                this.containers[i].containerCache.width = this.containers[i].element.outerWidth();
                                this.containers[i].containerCache.height = this.containers[i].element.outerHeight();
                        };
                }

                return this;
        },

        _createPlaceholder: function(that) {

                var self = that || this, o = self.options;

                if(!o.placeholder || o.placeholder.constructor == String) {
                        var className = o.placeholder;
                        o.placeholder = {
                                element: function() {

                                        var el = $(document.createElement(self.currentItem[0].nodeName))
                                                .addClass(className || self.currentItem[0].className+" ui-sortable-placeholder")
                                                .removeClass("ui-sortable-helper")[0];

                                        if(!className)
                                                el.style.visibility = "hidden";

                                        return el;
                                },
                                update: function(container, p) {

                                        // 1. If a className is set as 'placeholder option, we don't force sizes - the class is responsible for that
                                        // 2. The option 'forcePlaceholderSize can be enabled to force it even if a class name is specified
                                        if(className && !o.forcePlaceholderSize) return;

                                        //If the element doesn't have a actual height by itself (without styles coming from a stylesheet), it receives the inline height from the dragged item
                                        if(!p.height()) { p.height(self.currentItem.innerHeight() - parseInt(self.currentItem.css('paddingTop')||0, 10) - parseInt(self.currentItem.css('paddingBottom')||0, 10)); };
                                        if(!p.width()) { p.width(self.currentItem.innerWidth() - parseInt(self.currentItem.css('paddingLeft')||0, 10) - parseInt(self.currentItem.css('paddingRight')||0, 10)); };
                                }
                        };
                }

                //Create the placeholder
                self.placeholder = $(o.placeholder.element.call(self.element, self.currentItem));

                //Append it after the actual current item
                self.currentItem.after(self.placeholder);

                //Update the size of the placeholder (TODO: Logic to fuzzy, see line 316/317)
                o.placeholder.update(self, self.placeholder);

        },

        _contactContainers: function(event) {
               
                // get innermost container that intersects with item
                var innermostContainer = null, innermostIndex = null;          
               
               
                for (var i = this.containers.length - 1; i >= 0; i--){

                        // never consider a container that's located within the item itself
                        if($.ui.contains(this.currentItem[0], this.containers[i].element[0]))
                                continue;

                        if(this._intersectsWith(this.containers[i].containerCache)) {

                                // if we've already found a container and it's more "inner" than this, then continue
                                if(innermostContainer && $.ui.contains(this.containers[i].element[0], innermostContainer.element[0]))
                                        continue;

                                innermostContainer = this.containers[i];
                                innermostIndex = i;
                                       
                        } else {
                                // container doesn't intersect. trigger "out" event if necessary
                                if(this.containers[i].containerCache.over) {
                                        this.containers[i]._trigger("out", event, this._uiHash(this));
                                        this.containers[i].containerCache.over = 0;
                                }
                        }

                }
               
                // if no intersecting containers found, return
                if(!innermostContainer) return;

                // move the item into the container if it's not there already
                if(this.currentContainer != this.containers[innermostIndex]) {

                        //When entering a new container, we will find the item with the least distance and append our item near it
                        var dist = 10000; var itemWithLeastDistance = null; var base = this.positionAbs[this.containers[innermostIndex].floating ? 'left' : 'top'];
                        for (var j = this.items.length - 1; j >= 0; j--) {
                                if(!$.ui.contains(this.containers[innermostIndex].element[0], this.items[j].item[0])) continue;
                                var cur = this.items[j][this.containers[innermostIndex].floating ? 'left' : 'top'];
                                if(Math.abs(cur - base) < dist) {
                                        dist = Math.abs(cur - base); itemWithLeastDistance = this.items[j];
                                }
                        }

                        if(!itemWithLeastDistance && !this.options.dropOnEmpty) //Check if dropOnEmpty is enabled
                                return;

                        this.currentContainer = this.containers[innermostIndex];
                        itemWithLeastDistance ? this._rearrange(event, itemWithLeastDistance, null, true) : this._rearrange(event, null, this.containers[innermostIndex].element, true);
                        this._trigger("change", event, this._uiHash());
                        this.containers[innermostIndex]._trigger("change", event, this._uiHash(this));

                        //Update the placeholder
                        this.options.placeholder.update(this.currentContainer, this.placeholder);
               
                }
       
                this.containers[innermostIndex]._trigger("over", event, this._uiHash(this));
                this.containers[innermostIndex].containerCache.over = 1;
               
        },

        _createHelper: function(event) {

                var o = this.options;
                var helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [event, this.currentItem])) : (o.helper == 'clone' ? this.currentItem.clone() : this.currentItem);

                if(!helper.parents('body').length) //Add the helper to the DOM if that didn't happen already
                        $(o.appendTo != 'parent' ? o.appendTo : this.currentItem[0].parentNode)[0].appendChild(helper[0]);

                if(helper[0] == this.currentItem[0])
                        this._storedCSS = { width: this.currentItem[0].style.width, height: this.currentItem[0].style.height, position: this.currentItem.css("position"), top: this.currentItem.css("top"), left: this.currentItem.css("left") };

                if(helper[0].style.width == '' || o.forceHelperSize) helper.width(this.currentItem.width());
                if(helper[0].style.height == '' || o.forceHelperSize) helper.height(this.currentItem.height());

                return helper;

        },

        _adjustOffsetFromHelper: function(obj) {
                if (typeof obj == 'string') {
                        obj = obj.split(' ');
                }
                if ($.isArray(obj)) {
                        obj = {left: +obj[0], top: +obj[1] || 0};
                }
                if ('left' in obj) {
                        this.offset.click.left = obj.left + this.margins.left;
                }
                if ('right' in obj) {
                        this.offset.click.left = this.helperProportions.width - obj.right + this.margins.left;
                }
                if ('top' in obj) {
                        this.offset.click.top = obj.top + this.margins.top;
                }
                if ('bottom' in obj) {
                        this.offset.click.top = this.helperProportions.height - obj.bottom + this.margins.top;
                }
        },

        _getParentOffset: function() {


                //Get the offsetParent and cache its position
                this.offsetParent = this.helper.offsetParent();
                var po = this.offsetParent.offset();

                // This is a special case where we need to modify a offset calculated on start, since the following happened:
                // 1. The position of the helper is absolute, so it's position is calculated based on the next positioned parent
                // 2. The actual offset parent is a child of the scroll parent, and the scroll parent isn't the document, which means that
                //    the scroll is included in the initial calculation of the offset of the parent, and never recalculated upon drag
                if(this.cssPosition == 'absolute' && this.scrollParent[0] != document && $.ui.contains(this.scrollParent[0], this.offsetParent[0])) {
                        po.left += this.scrollParent.scrollLeft();
                        po.top += this.scrollParent.scrollTop();
                }

                if((this.offsetParent[0] == document.body) //This needs to be actually done for all browsers, since pageX/pageY includes this information
                || (this.offsetParent[0].tagName && this.offsetParent[0].tagName.toLowerCase() == 'html' && $.browser.msie)) //Ugly IE fix
                        po = { top: 0, left: 0 };

                return {
                        top: po.top + (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
                        left: po.left + (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
                };

        },

        _getRelativeOffset: function() {

                if(this.cssPosition == "relative") {
                        var p = this.currentItem.position();
                        return {
                                top: p.top - (parseInt(this.helper.css("top"),10) || 0) + this.scrollParent.scrollTop(),
                                left: p.left - (parseInt(this.helper.css("left"),10) || 0) + this.scrollParent.scrollLeft()
                        };
                } else {
                        return { top: 0, left: 0 };
                }

        },

        _cacheMargins: function() {
                this.margins = {
                        left: (parseInt(this.currentItem.css("marginLeft"),10) || 0),
                        top: (parseInt(this.currentItem.css("marginTop"),10) || 0)
                };
        },

        _cacheHelperProportions: function() {
                this.helperProportions = {
                        width: this.helper.outerWidth(),
                        height: this.helper.outerHeight()
                };
        },

        _setContainment: function() {

                var o = this.options;
                if(o.containment == 'parent') o.containment = this.helper[0].parentNode;
                if(o.containment == 'document' || o.containment == 'window') this.containment = [
                        0 - this.offset.relative.left - this.offset.parent.left,
                        0 - this.offset.relative.top - this.offset.parent.top,
                        $(o.containment == 'document' ? document : window).width() - this.helperProportions.width - this.margins.left,
                        ($(o.containment == 'document' ? document : window).height() || document.body.parentNode.scrollHeight) - this.helperProportions.height - this.margins.top
                ];

                if(!(/^(document|window|parent)$/).test(o.containment)) {
                        var ce = $(o.containment)[0];
                        var co = $(o.containment).offset();
                        var over = ($(ce).css("overflow") != 'hidden');

                        this.containment = [
                                co.left + (parseInt($(ce).css("borderLeftWidth"),10) || 0) + (parseInt($(ce).css("paddingLeft"),10) || 0) - this.margins.left,
                                co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) + (parseInt($(ce).css("paddingTop"),10) || 0) - this.margins.top,
                                co.left+(over ? Math.max(ce.scrollWidth,ce.offsetWidth) : ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - (parseInt($(ce).css("paddingRight"),10) || 0) - this.helperProportions.width - this.margins.left,
                                co.top+(over ? Math.max(ce.scrollHeight,ce.offsetHeight) : ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - (parseInt($(ce).css("paddingBottom"),10) || 0) - this.helperProportions.height - this.margins.top
                        ];
                }

        },

        _convertPositionTo: function(d, pos) {

                if(!pos) pos = this.position;
                var mod = d == "absolute" ? 1 : -1;
                var o = this.options, scroll = this.cssPosition == 'absolute' && !(this.scrollParent[0] != document && $.ui.contains(this.scrollParent[0], this.offsetParent[0])) ? this.offsetParent : this.scrollParent, scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);

                return {
                        top: (
                                pos.top                                                                                                                                 // The absolute mouse position
                                + this.offset.relative.top * mod                                                                                // Only for relative positioned nodes: Relative offset from element to offset parent
                                + this.offset.parent.top * mod                                                                                  // The offsetParent's offset without borders (offset + border)
                                - ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) ) * mod)
                        ),
                        left: (
                                pos.left                                                                                                                                // The absolute mouse position
                                + this.offset.relative.left * mod                                                                               // Only for relative positioned nodes: Relative offset from element to offset parent
                                + this.offset.parent.left * mod                                                                                 // The offsetParent's offset without borders (offset + border)
                                - ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollLeft() : scrollIsRootNode ? 0 : scroll.scrollLeft() ) * mod)
                        )
                };

        },

        _generatePosition: function(event) {

                var o = this.options, scroll = this.cssPosition == 'absolute' && !(this.scrollParent[0] != document && $.ui.contains(this.scrollParent[0], this.offsetParent[0])) ? this.offsetParent : this.scrollParent, scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);

                // This is another very weird special case that only happens for relative elements:
                // 1. If the css position is relative
                // 2. and the scroll parent is the document or similar to the offset parent
                // we have to refresh the relative offset during the scroll so there are no jumps
                if(this.cssPosition == 'relative' && !(this.scrollParent[0] != document && this.scrollParent[0] != this.offsetParent[0])) {
                        this.offset.relative = this._getRelativeOffset();
                }

                var pageX = event.pageX;
                var pageY = event.pageY;

                /*
                 * - Position constraining -
                 * Constrain the position to a mix of grid, containment.
                 */

                if(this.originalPosition) { //If we are not dragging yet, we won't check for options

                        if(this.containment) {
                                if(event.pageX - this.offset.click.left < this.containment[0]) pageX = this.containment[0] + this.offset.click.left;
                                if(event.pageY - this.offset.click.top < this.containment[1]) pageY = this.containment[1] + this.offset.click.top;
                                if(event.pageX - this.offset.click.left > this.containment[2]) pageX = this.containment[2] + this.offset.click.left;
                                if(event.pageY - this.offset.click.top > this.containment[3]) pageY = this.containment[3] + this.offset.click.top;
                        }

                        if(o.grid) {
                                var top = this.originalPageY + Math.round((pageY - this.originalPageY) / o.grid[1]) * o.grid[1];
                                pageY = this.containment ? (!(top - this.offset.click.top < this.containment[1] || top - this.offset.click.top > this.containment[3]) ? top : (!(top - this.offset.click.top < this.containment[1]) ? top - o.grid[1] : top + o.grid[1])) : top;

                                var left = this.originalPageX + Math.round((pageX - this.originalPageX) / o.grid[0]) * o.grid[0];
                                pageX = this.containment ? (!(left - this.offset.click.left < this.containment[0] || left - this.offset.click.left > this.containment[2]) ? left : (!(left - this.offset.click.left < this.containment[0]) ? left - o.grid[0] : left + o.grid[0])) : left;
                        }

                }

                return {
                        top: (
                                pageY                                                                                                                           // The absolute mouse position
                                - this.offset.click.top                                                                                                 // Click offset (relative to the element)
                                - this.offset.relative.top                                                                                              // Only for relative positioned nodes: Relative offset from element to offset parent
                                - this.offset.parent.top                                                                                                // The offsetParent's offset without borders (offset + border)
                                + ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) ))
                        ),
                        left: (
                                pageX                                                                                                                           // The absolute mouse position
                                - this.offset.click.left                                                                                                // Click offset (relative to the element)
                                - this.offset.relative.left                                                                                             // Only for relative positioned nodes: Relative offset from element to offset parent
                                - this.offset.parent.left                                                                                               // The offsetParent's offset without borders (offset + border)
                                + ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollLeft() : scrollIsRootNode ? 0 : scroll.scrollLeft() ))
                        )
                };

        },

        _rearrange: function(event, i, a, hardRefresh) {

                a ? a[0].appendChild(this.placeholder[0]) : i.item[0].parentNode.insertBefore(this.placeholder[0], (this.direction == 'down' ? i.item[0] : i.item[0].nextSibling));

                //Various things done here to improve the performance:
                // 1. we create a setTimeout, that calls refreshPositions
                // 2. on the instance, we have a counter variable, that get's higher after every append
                // 3. on the local scope, we copy the counter variable, and check in the timeout, if it's still the same
                // 4. this lets only the last addition to the timeout stack through
                this.counter = this.counter ? ++this.counter : 1;
                var self = this, counter = this.counter;

                window.setTimeout(function() {
                        if(counter == self.counter) self.refreshPositions(!hardRefresh); //Precompute after each DOM insertion, NOT on mousemove
                },0);

        },

        _clear: function(event, noPropagation) {

                this.reverting = false;
                // We delay all events that have to be triggered to after the point where the placeholder has been removed and
                // everything else normalized again
                var delayedTriggers = [], self = this;

                // We first have to update the dom position of the actual currentItem
                // Note: don't do it if the current item is already removed (by a user), or it gets reappended (see #4088)
                if(!this._noFinalSort && this.currentItem[0].parentNode) this.placeholder.before(this.currentItem);
                this._noFinalSort = null;

                if(this.helper[0] == this.currentItem[0]) {
                        for(var i in this._storedCSS) {
                                if(this._storedCSS[i] == 'auto' || this._storedCSS[i] == 'static') this._storedCSS[i] = '';
                        }
                        this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper");
                } else {
                        this.currentItem.show();
                }

                if(this.fromOutside && !noPropagation) delayedTriggers.push(function(event) { this._trigger("receive", event, this._uiHash(this.fromOutside)); });
                if((this.fromOutside || this.domPosition.prev != this.currentItem.prev().not(".ui-sortable-helper")[0] || this.domPosition.parent != this.currentItem.parent()[0]) && !noPropagation) delayedTriggers.push(function(event) { this._trigger("update", event, this._uiHash()); }); //Trigger update callback if the DOM position has changed
                if(!$.ui.contains(this.element[0], this.currentItem[0])) { //Node was moved out of the current element
                        if(!noPropagation) delayedTriggers.push(function(event) { this._trigger("remove", event, this._uiHash()); });
                        for (var i = this.containers.length - 1; i >= 0; i--){
                                if($.ui.contains(this.containers[i].element[0], this.currentItem[0]) && !noPropagation) {
                                        delayedTriggers.push((function(c) { return function(event) { c._trigger("receive", event, this._uiHash(this)); };  }).call(this, this.containers[i]));
                                        delayedTriggers.push((function(c) { return function(event) { c._trigger("update", event, this._uiHash(this));  }; }).call(this, this.containers[i]));
                                }
                        };
                };

                //Post events to containers
                for (var i = this.containers.length - 1; i >= 0; i--){
                        if(!noPropagation) delayedTriggers.push((function(c) { return function(event) { c._trigger("deactivate", event, this._uiHash(this)); };  }).call(this, this.containers[i]));
                        if(this.containers[i].containerCache.over) {
                                delayedTriggers.push((function(c) { return function(event) { c._trigger("out", event, this._uiHash(this)); };  }).call(this, this.containers[i]));
                                this.containers[i].containerCache.over = 0;
                        }
                }

                //Do what was originally in plugins
                if(this._storedCursor) $('body').css("cursor", this._storedCursor); //Reset cursor
                if(this._storedOpacity) this.helper.css("opacity", this._storedOpacity); //Reset opacity
                if(this._storedZIndex) this.helper.css("zIndex", this._storedZIndex == 'auto' ? '' : this._storedZIndex); //Reset z-index

                this.dragging = false;
                if(this.cancelHelperRemoval) {
                        if(!noPropagation) {
                                this._trigger("beforeStop", event, this._uiHash());
                                for (var i=0; i < delayedTriggers.length; i++) { delayedTriggers[i].call(this, event); }; //Trigger all delayed events
                                this._trigger("stop", event, this._uiHash());
                        }
                        return false;
                }

                if(!noPropagation) this._trigger("beforeStop", event, this._uiHash());

                //$(this.placeholder[0]).remove(); would have been the jQuery way - unfortunately, it unbinds ALL events from the original node!
                this.placeholder[0].parentNode.removeChild(this.placeholder[0]);

                if(this.helper[0] != this.currentItem[0]) this.helper.remove(); this.helper = null;

                if(!noPropagation) {
                        for (var i=0; i < delayedTriggers.length; i++) { delayedTriggers[i].call(this, event); }; //Trigger all delayed events
                        this._trigger("stop", event, this._uiHash());
                }

                this.fromOutside = false;
                return true;

        },

        _trigger: function() {
                if ($.Widget.prototype._trigger.apply(this, arguments) === false) {
                        this.cancel();
                }
        },

        _uiHash: function(inst) {
                var self = inst || this;
                return {
                        helper: self.helper,
                        placeholder: self.placeholder || $([]),
                        position: self.position,
                        originalPosition: self.originalPosition,
                        offset: self.positionAbs,
                        item: self.currentItem,
                        sender: inst ? inst.element : null
                };
        }

});

$.extend($.ui.sortable, {
        version: "@VERSION",
        eventPrefix: "sort"
});

})(jQuery);


